Magnetic carbon holder



Nov. 10,1925. I 1,561,197

W. WENDERHOLD MAGNETIC CARBON HOLDER Filed Oct. 29. 1917 Patented Nov. 10, 1925.

UNITED STTE ATENT OFFICE.

WILLIAM WENDERHOLD, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO EDWIN Zl'. BIINZHYAF, OF NEVJ YORK, N. Y.

MAGNETIC CARBON HOLDER.

Application filed October 29, 1917.

To all whom may concern:

Be it known that I, WILLIAM ENDER- HOLD, a citizen of the United States, residing at New York city, in the county and State of New York, have invented certain new and useful Improvements in Magnetic Carbon Holders, of which the following is a clear, full, and exact description.

The object of my invention is to provide a carbon holder for electric arc lamps which will insure constant contact between the carbon and the electric conductor supporting the carbon.

In arc lamps such as usually employed in projection lanterns and motion picture apparatus, the carbon holders generally are of a vise-like type, often heating up considerably and causing the carbon to become loosely held and thereby causing a faulty contact between the carbon and the conductor, although excessive pressure had been put on the carbon holder by means of the clamp screw.

Referring to the drawings: Fig. 1 is a side-elevation of a hand feed arc lamp, provided with my carbon holder. Fig. 2 is a top view of the carbon holder proper.

As shown in Fig. 1, the general support for the lamp is designated by 1. The lamp is operated by the usual feed knob 2 and is well known to those familiar with the art. The carbon holders 5 and 7 illustrate the nature of my invention.

As shown in Fi 2, 5 is the main support of the carbon 6. is an arm pivotally con Serial No. 199,167.

nected to the main support 5 at point 7*. 5 and 7 combined are the holders of the can bon 6. As seen in Fig. 2, the yoke 7 can be pressed upon the carbon 6 by screw 8. This is done merely to hold the carbon in position until the magnetic, force is employed.

The magnet 9 having core 10 is supplied with current by means of wires 11 and 12. When current is supplied to the magnet it will exert a pull upon the adjustment plug 13, which is mounted in insulating material 14 which is securely mounted in the carbon holder yoke 7. The wire 15 supplies the current for the arc. Member 14 insulates the current for the are from the current for the magnetic field. Of course it is understood that member 13 must be made of some material which is readily attracted by a magnetic force, such as iron or steel.

What I claim as my invention is:

The combination of arms pivoted relatively to each other at a point intermediate their ends, jaws on one end of said arms adapted to clamp and hold an electrode therebetween, an adjustable member carried by one of said jaws for bearing against the free arm of the other of said jaw members, and a magnet positioned to further close and clamp the jaw members when energized, by acting on the end of the free arm to thereby retain a constant pressure on the electrode member clamped between said aws.

Signed at the city, county and State of New York, this 26th day of October, one thousand nine hundred and seventeen.

WILLIAM WENDERHOLD. [n s.] 

